Carburetor



06L 1-9-30- o. z. FRAZIER 1,778,215

CARBURETOR Filed Aug. 10, 1925 7 1a INVENTOR Orville Z. Frazxev a BY (55 W ATT RNEY Patented Oct. 14, 1930 UNITED STATES PATENT OFFICE ORVILLE Z. FRAZIER, OF PONTIAC, MICHIGAN, ASSIGIl'OR OI ONE-HALF T0 JACK HOLLOWAY, 0F GRAND RAPIDS, MICHIGAN CARBURETOR Application filed August 10, 1925. Serial No. 49,244.

This invention relates to carburetors for internal combustion engines.

It is an object of the invention to provide a carburetor having a plurality of mixing passages and having fuel openings discharging separately into said passages and to provide for successively bringing said passages and fuel openings into use by travel of a common control element.

Another object is to provide a carburetor having a mixing chamber of Venturi shape with one passage approaching the neck of the venturi and two passages leading from said neck, and having separate provision for delivering fuel at the'neck of the venturi into the two last mentioned passages, and further having a common provision for controlling a mixture fiow through said passages.

Still another object is to provide a carburetor in which the usual float control for the fuel will be replaced by a valve responding to the pressure drop within the mixture passage of the carburetor when the engine is running.

A still further object is to provide a carburetor having a dual provision for continuously producing an explosive mixture and having a control member movable to gradual- 1y increase the flow through one of said-passages until the same is open to its full capacity, and further movable to provide for higher speeds by gradual uncovering of the said second passage.

These and various other objects will be apparent from the following description wherein reference is made to the accompanying drawing illustrating a preferred embodiment of my invention.

Figure 1 is a view in vertical sectional elevation of the improved carburetor.

' Figure 2 is a sectional view taken upon the line 22 of Figure 1, and primarily disclosing the mixture control throttle.

Figure 3 is a horizontal sectional view taken upon the line 3-3 of Figure 1.

Figure 4 is a vertical sectional view taken upon the line 4.-4 of Figure 3.

In these views the reference character 1 designates a mixing chamber which at one end is open to the atmosphere as indicated at 2 while its other extremity is adapted to be connected to the intake manifold 3 of an internal combustion engine. \Vithin the intake end of said chamber, a suitable throttle at is pivotally mounted. At the outlet side of its neck portion 5, a partition 6 produces separate flaring passages 7 and 8, both leading from the neck portion 5 of said chamber.

9 designates a valve casing which projects integrally upward from the central portion of the mixing chamber 1. A pair of needle valves 10 are vertically arranged in cham bers 11 of the casing 9 to separately control a discharge of fuel from said chambers through port 12 into the neck portion of the mixing chamber, said port as best seen in Figure 4, opening respectively into the passages 7 and 8 substantially at their communication with the approach portion of the mixing' chamber. The needle valves 10 have their upper portions threaded into the casing 9 and provided with milled adjusting head 13, as is common practice. 14: designates a pair of small pistons which are adapted to reciprocate in cylindrical bores 15 in the casing 9, the upper portion of said bores having communication by way of ports 16 with the chambers 11. Said pistons carry upon their lower ends needle valves 17 which, in the lower limiting positions of the pistons, close fuel outlets opening into the ower end of the bores, 15 from a fuel assage 18 to which fuel is supplied by a pipe 19. Each of the pistons 14, when raised, uncovers a port 20 through which fuel may discharge from the lower portion of the bore 15 into the adjacent chamber 11. v

The mixture passages 7 and 8 are controlled in common by a shutter 21 pivoted at 22 within a chamber 23 upon the outlet end of the mixing chamber, said chamber having a re movable cover 24. The pivot 22 of said shutter carries an actuating arm 25 from which a control rod 26 leads to any desired point of control.

In the operation of the described invenvention, the quantity of mixture delivered to the manifold 3 is controlled by the shutter 21, the latterv being shown in Figure 2 fully open in full lines and in closed position in I linesl As said shutter is actuated from i the latter to the former position, the assage g .7 ,is first rogressively uncovered, teflow thus'estab 'shed being ordinarily adequate 21, whereby the passage 8 is adually uncovcred; Thus it is seen that t e control member 21 acts first to regulate the flow through.

' ll one. of two fuel mixing assages and when,

p s the full capacity thereof 1s'reached,the con-- 15 tinned opening movement of said control member progressively supplements the first Y mentioned passage by the capacity of the seci ond passage.

f The pistons 14 areadapted to raiseresp'onsive to engine suction acting in .thismixing chamber and transmitted. to the bores 15'by I we of the port 12 chamber 11 and port 16.

1 aising of either piston 14 unse'ats the neeflow from the pipev 19 by way of the passage 18 into-the lower end of the corresponding port 15 and from the latter by way of port Y 20,chambers 11 and port 12 to the mixing Y chamber.: The pistons 14- are sufficiently c so heavy to drop oftheir own weight when sucthus causing tion above said pistons stopfsi, h f 1 fl t e ue ow the needle valve 17 to out o from the pipe 19. 1 f An important advantage secured b the controlled fuel valves and the uncertainty of their 0 eration.

, BK t e provision of the dual fuel openings disc arging into the mixing chamber and dual mixture passages-respectively supplied with'fuel by said openings, there'is insured a proper regulation of the fuel supply to the intake manifold under all conditions of oper-,

ation. I

. ,By successively uncoveringfthe mixture passages, one for comparatively low. operation, and the other for relatively i h speeds the size of the passages are properi in proportion to the amount of fuel whic said passages are reguired to deliver. This is not true, of the or delivers. its mixture through the same assage regardless of thequantity of such uel."

Because of the elimination of a float chamber,

more compact than such constructions as are now generally used.

From the foregoing it becomes evident that 3 the device is very slmple andeflicient and rovides a device which accomplishes the obects described.

While it will be apparent that the illustratedembodiment of my inventionherein disclosed is well calculated to adequately fulfill e5 1 the objects and advantages primarily stated,

in the fuel feed'chamber, means for deliver-' describedinvention is the elimination o float feed chamber, means establishing a fuel deeed marycarburetor which l the described carburetor may beconsiderably I 1. Acarburetor comprising a mixing cham- Y bar, a .valve chamber having an outlet to the Lmixing chamber,- a cylinder, a fuellsuppl-y passage "having a fuel deliver with one end portion of saidfcy inder, means {establishing a fuel delivery connection from connection said end portion ofthe cylinderto said valve chamber, a suction transmitting passage from said valve, chamber to the other end portion of said cylinder 0. iston reciprocatoryin the cylinder betwedn end portions a valve member carried by said piston and control ling said-fuel delivery connection, and a 'v'alve member in said valve chamber controlling the outlet of said chamber .to the mixing-chamber. .c

2. A carburetor co 'prisingamixingchamv v I ,ber, a-ffuelfeed-chamber', and a regulating dle valve carried thereby, and permits a fuel valve chamber, a suction responsive member ing fuelto said feed chamber at one side of {said suction-responsive member, means for delivering fuel irom said feed "chamber at said side of the suction responsive member to the valve .chamber,' .a-suction-transmitting 5 connection from the valve chamber opening into said 'feed'cha'mber at the other side of said suction-responsive member, an element carried by said suctlon-responslve'member exercising control'of the fue delivery to said livery and suction-transmitting connection to the mixing chamber fromsaid valve chamber,

her controlling said connection. 1

In witness whereofIhereunto setm hand.

. ORVILLE FRAZ ER.-

i "I 11o 120 

